The aim of the study was to determinate the effect of soybean plant arrangement on the number and dynamics of the most important herbivores. Preliminary studies were carried out in 2015, at RZD Pawłowice, Poland belonging to Wrocław University of Environmental and Life Sciences. Colonization of plants by herbivores was compared for row spacing 15 and 30 cm and also for seeding rate 50 and 90 seeds per square meter. Plants were directly observed throughout the vegetation season and sweep net was also used for collecting arthropods. It has been demonstrated, that the row spacing has a significant impact on the incidence of herbivorous organisms. Thrips were most numerous group of arthropods that appeared on the soybean plants. A total of 2371 specimens were observed during collecting with entomological net and 1902 individuals during plant observations. Also great number of aphids, flea beetles and caterpillars occurred on soybean plants. Most of these pests inhabited soybean growing in the lower density.
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